K3 suddenly dies
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Sometimes the screws holding the board to the capacitors loosen up after a few years.
On 10/17/2013 7:14 AM, Gary, W7TEA wrote: > Good morning Don. The PS suddenly died on me at our beach house in Long Beach. I had > no equipment there and first assumed it was my K3. Brought the rig home to Portland > and it worked fine. So, it was the supply, an Astron RS35A--couple years old. Anyway, > checked the fuse, cleaned contacts etc and it was .8v at the terminals. . So, I > replaced the voltage IC which I got from Mouser and used Deoxit on the the voltage > adjustment pot. I have another RS35A which has run fine for over 30 years. > > I don't feel comfortable playing around inside a live supply but will take the cover > off and do another visual inspection while unplugged. It has to be something simple I > would think. > > thanks Don, Gary W7TEA > > > > > On Oct 17, 2013, at 5:42 AM, "Don Wilhelm-4 [via Elecraft]" > <[hidden email]> wrote: > >> You did not show any of the prior information (one of the problems with posts from >> Nabble), so I can only guess that you are working with a power supply problem. A >> situation like that is often caused by something loose in the negative side of the >> supply, something that is frequently overlooked. >> >> 73, Don W3FPR >> >> On 10/17/2013 1:54 AM, Gary, W7TEA wrote: >>> Well, traded out the voltage regulator IC and no joy. Then I tried Deoxit on the >>> adjustment pot, tweaked it a bit and measured voltage at 13.8vdc! Great! Turned it >>> off and on, tried it again, and was ready start bragging to the XYL---but it was >>> back to .8v. Didn't see any suspect components while I had it open. >>> -- Vic, K2VCO Fresno CA http://www.qsl.net/k2vco/ ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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Discharge the cap BEFORE trying to tighten or loosen the screws.
________________________________ From: Vic K2VCO <[hidden email]> To: [hidden email] Sent: Thursday, October 17, 2013 3:37 PM Subject: Re: [Elecraft] K3 suddenly dies Sometimes the screws holding the board to the capacitors loosen up after a few years. On 10/17/2013 7:14 AM, Gary, W7TEA wrote: > Good morning Don. The PS suddenly died on me at our beach house in Long Beach. I had > no equipment there and first assumed it was my K3. Brought the rig home to Portland > and it worked fine. So, it was the supply, an Astron RS35A--couple years old. Anyway, > checked the fuse, cleaned contacts etc and it was .8v at the terminals. . So, I > replaced the voltage IC which I got from Mouser and used Deoxit on the the voltage > adjustment pot. I have another RS35A which has run fine for over 30 years. > > I don't feel comfortable playing around inside a live supply but will take the cover > off and do another visual inspection while unplugged. It has to be something simple I > would think. > > thanks Don, Gary W7TEA > > > > > On Oct 17, 2013, at 5:42 AM, "Don Wilhelm-4 [via Elecraft]" > <[hidden email]> wrote: > >> You did not show any of the prior information (one of the problems with posts from >> Nabble), so I can only guess that you are working with a power supply problem. A >> situation like that is often caused by something loose in the negative side of the >> supply, something that is frequently overlooked. >> >> 73, Don W3FPR >> >> On 10/17/2013 1:54 AM, Gary, W7TEA wrote: >>> Well, traded out the voltage regulator IC and no joy. Then I tried Deoxit on the >>> adjustment pot, tweaked it a bit and measured voltage at 13.8vdc! Great! Turned it >>> off and on, tried it again, and was ready start bragging to the XYL---but it was >>> back to .8v. Didn't see any suspect components while I had it open. >>> -- Vic, K2VCO Fresno CA http://www.qsl.net/k2vco/ ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by Vic Rosenthal
I have had the board off a couple of times to reseat and then to change out the voltage reg IC and to
adjust the trimmer. I have done a visual inspection but will check that all hardware is securely fastened. May have to invest in another assembled board if nothing else works. Thank you all for the ideas. Gary W7TEA On Oct 17, 2013, at 12:38 PM, "Vic K2VCO-2 [via Elecraft]" <[hidden email]> wrote: Sometimes the screws holding the board to the capacitors loosen up after a few years.
73,
Gary W7TEA K3 #1001, #5763 |
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I have an Astron 35A and was fishing around for details and found a guy
who talked about replacing the circuit board. I'm not sure it's necessary, but here's the link: http://www.repeater-builder.com/astron/pdf/w5bwc-rs35-rebuild.pdf On Thu, 17 Oct 2013, Gary, W7TEA wrote: > I have had the board off a couple of times to reseat and then to change out the voltage reg IC and to > adjust the trimmer. I have done a visual inspection but will check that all hardware is > securely fastened. May have to invest in another assembled board if nothing else works. > > Thank you all for the ideas. > > Gary W7TEA > > > On Oct 17, 2013, at 12:38 PM, "Vic K2VCO-2 [via Elecraft]" <[hidden email]> wrote: > >> Sometimes the screws holding the board to the capacitors loosen up after a few years. >> >> On 10/17/2013 7:14 AM, Gary, W7TEA wrote: >> >>> Good morning Don. The PS suddenly died on me at our beach house in Long Beach. I had >>> no equipment there and first assumed it was my K3. Brought the rig home to Portland >>> and it worked fine. So, it was the supply, an Astron RS35A--couple years old. Anyway, >>> checked the fuse, cleaned contacts etc and it was .8v at the terminals. . So, I >>> replaced the voltage IC which I got from Mouser and used Deoxit on the the voltage >>> adjustment pot. I have another RS35A which has run fine for over 30 years. >>> >>> I don't feel comfortable playing around inside a live supply but will take the cover >>> off and do another visual inspection while unplugged. It has to be something simple I >>> would think. >>> >>> thanks Don, Gary W7TEA >>> >>> >>> >>> >>> On Oct 17, 2013, at 5:42 AM, "Don Wilhelm-4 [via Elecraft]" >>> <[hidden email]> wrote: >>> >>>> You did not show any of the prior information (one of the problems with posts from >>>> Nabble), so I can only guess that you are working with a power supply problem. A >>>> situation like that is often caused by something loose in the negative side of the >>>> supply, something that is frequently overlooked. >>>> >>>> 73, Don W3FPR >>>> >>>> On 10/17/2013 1:54 AM, Gary, W7TEA wrote: >>>>> Well, traded out the voltage regulator IC and no joy. Then I tried Deoxit on the >>>>> adjustment pot, tweaked it a bit and measured voltage at 13.8vdc! Great! Turned it >>>>> off and on, tried it again, and was ready start bragging to the XYL---but it was >>>>> back to .8v. Didn't see any suspect components while I had it open. >>>>> >> >> -- >> Vic, K2VCO >> Fresno CA >> http://www.qsl.net/k2vco/ >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:[hidden email] >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> >> >> If you reply to this email, your message will be added to the discussion below: >> http://elecraft.365791.n2.nabble.com/K3-suddenly-dies-tp7579305p7579977.html >> To unsubscribe from K3 suddenly dies, click here. >> NAML > > > > > > ----- > 73, > > Gary W7TEA K3 #1001, #5763 > -- > View this message in context: http://elecraft.365791.n2.nabble.com/K3-suddenly-dies-tp7579305p7579979.html > Sent from the Elecraft mailing list archive at Nabble.com. > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > -- Hisashi T Fujinaka - [hidden email] BSEE(6/86) + BSChem(3/95) + BAEnglish(8/95) + MSCS(8/03) + $2.50 = latte ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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Thank you Hisashi! I called Astron and they quoted $26US including shipping.
Gary On Oct 17, 2013, at 2:26 PM, "Hisashi T Fujinaka [via Elecraft]" <[hidden email]> wrote: I have an Astron 35A and was fishing around for details and found a guy
73,
Gary W7TEA K3 #1001, #5763 |
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Keep in mind that the article I sent you is a complete refurb that even
replaces the pass transistors. I think googling around said the most likely culprit is a bad LM723, but I didn't look too hard since my Astron was working fine before I decided it made a nice footrest and bought a switching power supply. :) On Thu, 17 Oct 2013, Gary, W7TEA wrote: > Thank you Hisashi! I called Astron and they quoted $26US including shipping. > > Gary > > > On Oct 17, 2013, at 2:26 PM, "Hisashi T Fujinaka [via Elecraft]" <[hidden email]> wrote: > >> I have an Astron 35A and was fishing around for details and found a guy >> who talked about replacing the circuit board. I'm not sure it's >> necessary, but here's the link: >> >> http://www.repeater-builder.com/astron/pdf/w5bwc-rs35-rebuild.pdf >> >> On Thu, 17 Oct 2013, Gary, W7TEA wrote: >> >>> I have had the board off a couple of times to reseat and then to change out the voltage reg IC and to >>> adjust the trimmer. I have done a visual inspection but will check that all hardware is >>> securely fastened. May have to invest in another assembled board if nothing else works. >>> >>> Thank you all for the ideas. >>> >>> Gary W7TEA >>> >>> >>> On Oct 17, 2013, at 12:38 PM, "Vic K2VCO-2 [via Elecraft]" <[hidden email]> wrote: >>> >>>> Sometimes the screws holding the board to the capacitors loosen up after a few years. >>>> >>>> On 10/17/2013 7:14 AM, Gary, W7TEA wrote: >>>> >>>>> Good morning Don. The PS suddenly died on me at our beach house in Long Beach. I had >>>>> no equipment there and first assumed it was my K3. Brought the rig home to Portland >>>>> and it worked fine. So, it was the supply, an Astron RS35A--couple years old. Anyway, >>>>> checked the fuse, cleaned contacts etc and it was .8v at the terminals. . So, I >>>>> replaced the voltage IC which I got from Mouser and used Deoxit on the the voltage >>>>> adjustment pot. I have another RS35A which has run fine for over 30 years. >>>>> >>>>> I don't feel comfortable playing around inside a live supply but will take the cover >>>>> off and do another visual inspection while unplugged. It has to be something simple I >>>>> would think. >>>>> >>>>> thanks Don, Gary W7TEA >>>>> >>>>> >>>>> >>>>> >>>>> On Oct 17, 2013, at 5:42 AM, "Don Wilhelm-4 [via Elecraft]" >>>>> <[hidden email]> wrote: >>>>> >>>>>> You did not show any of the prior information (one of the problems with posts from >>>>>> Nabble), so I can only guess that you are working with a power supply problem. A >>>>>> situation like that is often caused by something loose in the negative side of the >>>>>> supply, something that is frequently overlooked. >>>>>> >>>>>> 73, Don W3FPR >>>>>> >>>>>> On 10/17/2013 1:54 AM, Gary, W7TEA wrote: >>>>>>> Well, traded out the voltage regulator IC and no joy. Then I tried Deoxit on the >>>>>>> adjustment pot, tweaked it a bit and measured voltage at 13.8vdc! Great! Turned it >>>>>>> off and on, tried it again, and was ready start bragging to the XYL---but it was >>>>>>> back to .8v. Didn't see any suspect components while I had it open. >>>>>>> >>>> >>>> -- >>>> Vic, K2VCO >>>> Fresno CA >>>> http://www.qsl.net/k2vco/ >>>> ______________________________________________________________ >>>> Elecraft mailing list >>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft >>>> Help: http://mailman.qth.net/mmfaq.htm >>>> Post: mailto:[hidden email] >>>> >>>> This list hosted by: http://www.qsl.net >>>> Please help support this email list: http://www.qsl.net/donate.html >>>> >>>> >>>> If you reply to this email, your message will be added to the discussion below: >>>> http://elecraft.365791.n2.nabble.com/K3-suddenly-dies-tp7579305p7579977.html >>>> To unsubscribe from K3 suddenly dies, click here. >>>> NAML >>> >>> >>> >>> >>> >>> ----- >>> 73, >>> >>> Gary W7TEA K3 #1001, #5763 >>> -- >>> View this message in context: http://elecraft.365791.n2.nabble.com/K3-suddenly-dies-tp7579305p7579979.html >>> Sent from the Elecraft mailing list archive at Nabble.com. >>> ______________________________________________________________ >>> Elecraft mailing list >>> Home: http://mailman.qth.net/mailman/listinfo/elecraft >>> Help: http://mailman.qth.net/mmfaq.htm >>> Post: mailto:[hidden email] >>> >>> This list hosted by: http://www.qsl.net >>> Please help support this email list: http://www.qsl.net/donate.html >>> >> >> -- >> Hisashi T Fujinaka - [hidden email] >> BSEE(6/86) + BSChem(3/95) + BAEnglish(8/95) + MSCS(8/03) + $2.50 = latte >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:[hidden email] >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> >> >> If you reply to this email, your message will be added to the discussion below: >> http://elecraft.365791.n2.nabble.com/K3-suddenly-dies-tp7579305p7579982.html >> To unsubscribe from K3 suddenly dies, click here. >> NAML > > > > > > ----- > 73, > > Gary W7TEA K3 #1001, #5763 > -- > View this message in context: http://elecraft.365791.n2.nabble.com/K3-suddenly-dies-tp7579305p7579983.html > Sent from the Elecraft mailing list archive at Nabble.com. > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > -- Hisashi T Fujinaka - [hidden email] BSEE(6/86) + BSChem(3/95) + BAEnglish(8/95) + MSCS(8/03) + $2.50 = latte ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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